/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.netbeans.modules.profiler.api;

import org.openide.util.Lookup;
import org.openide.util.lookup.Lookups;
import org.openide.util.lookup.ProxyLookup;

/**
 * IDE agnostic project definition wrapper.<br/>
 * Basically, a simple {@linkplain Lookup.Provider} which contains, as a part 
 * of its lookup, the real project implementation.
 * 
 * @author Jaroslav Bachorik
 */
public abstract class ProfilerProject implements Lookup.Provider {
    private final Object lkpLock = new Object();
    // @GuardedBy lkpLock
    private Lookup lkp;
    private Lookup.Provider provider;
    
    protected ProfilerProject(Lookup.Provider project) {
        this.provider = project;
    }

    @Override
    public Lookup getLookup() {
        synchronized(lkpLock) {
            if (lkp == null) {
                lkp = new ProxyLookup(provider.getLookup(), Lookups.fixed(provider, this), additionalLookup());
            }
            return lkp;
        }
    }
    
    protected abstract Lookup additionalLookup();
}
